Re: Sv: Emacs HTTP libraries [was: Re: How to contribute new package to GNU ELPA?]

[Eli Zaretskii]

> From: Clément Pit-Claudel <cpitclaudel@gmail.com>
> Date: Tue, 30 Mar 2021 12:13:55 -0400
> 
> >   (benchmark-run 1 (url-retrieve-synchronously
> >                     "https://ftp.gnu.org/gnu/emacs/emacs-27.2.tar.xz";))
> > 
> > in Emacs, and compared that with download by wget.  On my relatively
> > slow home connection I get almost the same times, down to less than
> > 2%.
> 
> On my decently fast home connection, Emacs takes 4.5s-5s to download that 
> file using the form you posted, and wget takes 1.4s-2s to download the same 
> file:
> 
> (benchmark-run 1 (url-retrieve-synchronously 
> "https://ftp.gnu.org/gnu/emacs/emacs-27.2.tar.xz";))
> ⇒ (4.875848555 13 3.7572300619999623)

But note that the actual Emacs download time was 4.876 - 3.757 = 1.319
sec, the rest was taken by GC.  What happens if you set
gc-cons-threshold to a very large value?

Also, nowadays we have a variable to tune how much stuff do we read in
one go (by default just 4K), so might as well test the effect of that
on download times.